Corrosion behavior of AlCuFeMn alloy in aqueous sodium chloride solution

Dutta, A and Sivaji, T and Ghosh, M and Fernandes, R and De, PS and Nayak, D and Sharma, R (2022) Corrosion behavior of AlCuFeMn alloy in aqueous sodium chloride solution. Materials Chemistry and Physics, 276 .

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Medium Entropy Alloy AlCuFeMn possesses high room temperature strength and oxidation endurance. In present work, the aqueous corrosion resistance of the as-cast as well as low temperature oxidized AlCuFeMn alloy in 3.5 wt% NaCl solution, is explored. Equimolar proportions of high purity copper, manganese, iron, and aluminum were arc melted and cast in a copper mold. The alloy primarily consists of a face-centered cubic and a bodycentered cubic phase. Potentiodynamic polarization tests on the alloy after low temperature surface oxidation reveal an aqueous corrosion resistance comparable to AISI 304 steel and CoCrFeMnNi high entropy alloy. The Xray photoelectron spectroscopic studies confirmed that the free surface in the as-cast alloy is in partially oxidized state. The same completely oxidizes after low-temperature surface oxidation. Such low temperature surface oxidation improves pitting corrosion resistance in AlCuFeMn alloy due to increased metal/oxide layer resistance. The electrochemical impedance spectroscopy tests coupled with microscopy confirmed that the principal corrosion mechanisms in the alloy are of the uniform and pitting type. The energy dispersive spectroscopy experiments indicate that a copper oxide enriched layer is formed on the surface oxidized specimen during corrosion.

Item Type:Article
Official URL/DOI:https://10.1016/j.matchemphys.2021.125397
Uncontrolled Keywords:Medium entropy alloy; EIS; XPS; Pitting corrosion; high-entropy alloys; pitting corrosion; electrochemical properties; eis; microstructure
Divisions:Material Science and Technology
ID Code:8472
Deposited By:Dr Mita Tarafder
Deposited On:30 Dec 2021 11:11
Last Modified:30 Dec 2021 11:11
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